Joseph h



(No Model.)

J. H. HOADLEY.

AIR COMPRESSOR.

Patented Peb. l, 1898.

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UNiTnn STATES PATENT @erica JOSEPH Il. IIOADLEY, OF NEV YORK, N. Y.,ASSIGNOR TO THE COMPRESSED- AIR POWER COMPANY, OF SAME PLACE.

AIR-COMPRESSOR.

SFECIFICATION forming part of Letters Patent No. 598,149, dated February1, 1898. Application tiled January 8, 1896. Serial No. 574,679. (Nomodel.)

To alli whom t may concern: ratio between the air-pressure and the tem-Be it known that I, JOSEPH H. HOADLEY, perature of the water. acitizenof the United States, and a resident F is a compound air-pressure pumpdriven of the city, county, and State of New York, by the air-motor A,G, I-I, and I being the 55 5 Vhave invented a cert-ain new and usefulImsuccessive low-pressure, medium-pressure, provement inAir-Compressors, of which the and high-pressure cylinders of the same,and following is a specification. K, L, and M the successive coolers andre- My invention relates to compound or mulceivers. The air from thefirst compressiontiple stage compressors in which the air is cylinder Gis taken by pipe O before it en- 6o xo compressed in succession by anumber of ters cooler and receiver K orby pipe O after cylinders, therst cylinder taking in atmosit leaves the latter and led to air-heaterC, as pheric air and after compressing it to a cershown. The firstcylinder G of the comtain degree passing it to an intermediate represseris made not only large enough to supceiver, which may also have meansfor cool ply its proper proportion of air to the cylin- 65 r 5 ing theair heated by compression, the air derH,butalsotosupply an additionalamount passing from thence to a second cylinder, to be used in theair-heater to furnish by abwhere it is again compressed to a stillhigher sorption of energy in said heater the power degree and thenpassed to a second Vreceiver to do the Work required. A or cooler, andso on. P is a piece of apparatus drawing air-pres- 7o zo My inventionconsists in combining such a y sure of the first degree through pipe R.

compressor with apparatus adapted to use air Q is a piece of apparatusrequiring prescompressed to different degrees, and in con sure of thesecond degree and supplied by structing the compound compressor so thatpipe R from the secondary receiver, and Sis the desired differentdegrees of pressure rea piece of apparatus adapted to be worked 7 5 25quired by the consuming apparatus will corby pressure of the thirddegree supplied respond with the different degrees of presthrough pipeR". sure produced by the different cylinders of The operation Will beclear from the followthe compressor. ing: The low-pressure cylinder G islarge My invention more specifically consists in enough to supply morecompressed air than 8o 3o combining such a compressor with an aircan beutilized by intermediate cylinder I-I, motor for driving the same and anair-heater and the cylinder H supplies more compressed taking air underone of the lesser degrees of air than can be utilized forhigh-pressurecylpressure, the cylinders producing such lesser vinder I. The surpluscompressed air from degree of pressure being made large enough cylinderGis led to heater C and serves to 85 35 to supply this extra draft oflow-pressure air operate air-motor A. For starting motor A and yetsupply its proportion of air to the or to make up any deficiency insupply from next cylinder in theseries. cylinder G air may be forcedinto heater The accompanying'drawing represents a through pipe D. A pipeR, leading from combination of apparatus embodying my imcooler K,supplies air to apparatus K, a pipe 9o 4o provenient. R from cooler Lsupplies the apparatus Q, A is an air-motor taking air under presand apipeR supplies the apparatus S from sure of, say, iive (5) atmospheresthrough the the high-pressure cooler and receiver M. pipe B from anair-heater C. The air-heater Having thus described my invention, what issimilar to an ordinary steam-boiler. The I claim, and desire to secureby Letters Pat- 95 45 cold air under pressure of, say, five and oneent,is-

half (521,-) atmospheres is forced in through l. The combination with acompound airpipe D u nder the water and allowed to percompressor havinga low-pressure cylinder colate up through the water, which is kept largeenough to supply more compressed air hot by means of furnace E. Anydesired than is required by the high-pressure cylin'- 10o `5o amount ofwater-vapor may be' allowed to der, of an apparatus driven by compressedair,

pass over with the air by having the proper and apassage leading fromthe compound aircompressor between the high and 10W pressure cylindersand communicating with said apparatus, substantially as set forth.

2. The combination with a, compound aireompressor having a 10W-pressurecylinder large enough 1.o supply more compressed air than is required bythe high-pressure cylinder, of a passage leading,` from said 10W-pres-

